2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: in6_src.c,v 1.132 2003/08/26 04:42:27 keiichi Exp $
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
68 #include "opt_mpath.h"
70 #include <sys/param.h>
71 #include <sys/systm.h>
73 #include <sys/malloc.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sockio.h>
80 #include <sys/sysctl.h>
81 #include <sys/errno.h>
83 #include <sys/kernel.h>
87 #include <net/route.h>
89 #include <net/radix_mpath.h>
92 #include <netinet/in.h>
93 #include <netinet/in_var.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/ip.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet6/in6_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/in6_pcb.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/scope6_var.h>
102 #include <netinet6/nd6.h>
104 static struct mtx addrsel_lock;
105 #define ADDRSEL_LOCK_INIT() mtx_init(&addrsel_lock, "addrsel_lock", NULL, MTX_DEF)
106 #define ADDRSEL_LOCK() mtx_lock(&addrsel_lock)
107 #define ADDRSEL_UNLOCK() mtx_unlock(&addrsel_lock)
108 #define ADDRSEL_LOCK_ASSERT() mtx_assert(&addrsel_lock, MA_OWNED)
110 static struct sx addrsel_sxlock;
111 #define ADDRSEL_SXLOCK_INIT() sx_init(&addrsel_sxlock, "addrsel_sxlock")
112 #define ADDRSEL_SLOCK() sx_slock(&addrsel_sxlock)
113 #define ADDRSEL_SUNLOCK() sx_sunlock(&addrsel_sxlock)
114 #define ADDRSEL_XLOCK() sx_xlock(&addrsel_sxlock)
115 #define ADDRSEL_XUNLOCK() sx_xunlock(&addrsel_sxlock)
117 #define ADDR_LABEL_NOTAPP (-1)
118 struct in6_addrpolicy defaultaddrpolicy;
120 int ip6_prefer_tempaddr = 0;
122 static int selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
123 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
124 struct rtentry **, int, int));
125 static int in6_selectif __P((struct sockaddr_in6 *, struct ip6_pktopts *,
126 struct ip6_moptions *, struct route_in6 *ro, struct ifnet **));
128 static struct in6_addrpolicy *lookup_addrsel_policy(struct sockaddr_in6 *);
130 static void init_policy_queue(void);
131 static int add_addrsel_policyent(struct in6_addrpolicy *);
132 static int delete_addrsel_policyent(struct in6_addrpolicy *);
133 static int walk_addrsel_policy __P((int (*)(struct in6_addrpolicy *, void *),
135 static int dump_addrsel_policyent(struct in6_addrpolicy *, void *);
136 static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
139 * Return an IPv6 address, which is the most appropriate for a given
140 * destination and user specified options.
141 * If necessary, this function lookups the routing table and returns
142 * an entry to the caller for later use.
144 #define REPLACE(r) do {\
145 if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
146 sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
147 ip6stat.ip6s_sources_rule[(r)]++; \
149 char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
150 printf("in6_selectsrc: replace %s with %s by %d\n", ia_best ? ip6_sprintf(ip6buf, &ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(ip6b, &ia->ia_addr.sin6_addr), (r)); \
154 #define NEXT(r) do {\
155 if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
156 sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
157 ip6stat.ip6s_sources_rule[(r)]++; \
159 char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
160 printf("in6_selectsrc: keep %s against %s by %d\n", ia_best ? ip6_sprintf(ip6buf, &ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(ip6b, &ia->ia_addr.sin6_addr), (r)); \
162 goto next; /* XXX: we can't use 'continue' here */ \
164 #define BREAK(r) do { \
165 if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
166 sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
167 ip6stat.ip6s_sources_rule[(r)]++; \
168 goto out; /* XXX: we can't use 'break' here */ \
172 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
173 struct ip6_moptions *mopts, struct route_in6 *ro,
174 struct in6_addr *laddr, struct ifnet **ifpp, int *errorp)
177 struct ifnet *ifp = NULL;
178 struct in6_ifaddr *ia = NULL, *ia_best = NULL;
179 struct in6_pktinfo *pi = NULL;
180 int dst_scope = -1, best_scope = -1, best_matchlen = -1;
181 struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
185 dst = dstsock->sin6_addr; /* make a copy for local operation */
191 * If the source address is explicitly specified by the caller,
192 * check if the requested source address is indeed a unicast address
193 * assigned to the node, and can be used as the packet's source
194 * address. If everything is okay, use the address as source.
196 if (opts && (pi = opts->ip6po_pktinfo) &&
197 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
198 struct sockaddr_in6 srcsock;
199 struct in6_ifaddr *ia6;
201 /* get the outgoing interface */
202 if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ifp))
208 * determine the appropriate zone id of the source based on
209 * the zone of the destination and the outgoing interface.
210 * If the specified address is ambiguous wrt the scope zone,
211 * the interface must be specified; otherwise, ifa_ifwithaddr()
212 * will fail matching the address.
214 bzero(&srcsock, sizeof(srcsock));
215 srcsock.sin6_family = AF_INET6;
216 srcsock.sin6_len = sizeof(srcsock);
217 srcsock.sin6_addr = pi->ipi6_addr;
219 *errorp = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
224 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)(&srcsock));
226 (ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) {
227 *errorp = EADDRNOTAVAIL;
230 pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
233 return (&ia6->ia_addr.sin6_addr);
237 * Otherwise, if the socket has already bound the source, just use it.
239 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
243 * If the address is not specified, choose the best one based on
244 * the outgoing interface and the destination address.
246 /* get the outgoing interface */
247 if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ifp)) != 0)
251 if (ifp == NULL) /* this should not happen */
252 panic("in6_selectsrc: NULL ifp");
254 *errorp = in6_setscope(&dst, ifp, &odstzone);
258 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
259 int new_scope = -1, new_matchlen = -1;
260 struct in6_addrpolicy *new_policy = NULL;
261 u_int32_t srczone, osrczone, dstzone;
263 struct ifnet *ifp1 = ia->ia_ifp;
266 * We'll never take an address that breaks the scope zone
267 * of the destination. We also skip an address if its zone
268 * does not contain the outgoing interface.
269 * XXX: we should probably use sin6_scope_id here.
271 if (in6_setscope(&dst, ifp1, &dstzone) ||
272 odstzone != dstzone) {
275 src = ia->ia_addr.sin6_addr;
276 if (in6_setscope(&src, ifp, &osrczone) ||
277 in6_setscope(&src, ifp1, &srczone) ||
278 osrczone != srczone) {
282 /* avoid unusable addresses */
284 (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
287 if (!ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
290 /* Rule 1: Prefer same address */
291 if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr)) {
293 BREAK(1); /* there should be no better candidate */
299 /* Rule 2: Prefer appropriate scope */
301 dst_scope = in6_addrscope(&dst);
302 new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
303 if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
304 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
307 } else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
308 if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
314 * Rule 3: Avoid deprecated addresses. Note that the case of
315 * !ip6_use_deprecated is already rejected above.
317 if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
319 if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
322 /* Rule 4: Prefer home addresses */
324 * XXX: This is a TODO. We should probably merge the MIP6
328 /* Rule 5: Prefer outgoing interface */
329 if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
331 if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
335 * Rule 6: Prefer matching label
336 * Note that best_policy should be non-NULL here.
338 if (dst_policy == NULL)
339 dst_policy = lookup_addrsel_policy(dstsock);
340 if (dst_policy->label != ADDR_LABEL_NOTAPP) {
341 new_policy = lookup_addrsel_policy(&ia->ia_addr);
342 if (dst_policy->label == best_policy->label &&
343 dst_policy->label != new_policy->label)
345 if (dst_policy->label != best_policy->label &&
346 dst_policy->label == new_policy->label)
351 * Rule 7: Prefer public addresses.
352 * We allow users to reverse the logic by configuring
353 * a sysctl variable, so that privacy conscious users can
354 * always prefer temporary addresses.
357 opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
358 prefer_tempaddr = ip6_prefer_tempaddr;
359 } else if (opts->ip6po_prefer_tempaddr ==
360 IP6PO_TEMPADDR_NOTPREFER) {
364 if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
365 (ia->ia6_flags & IN6_IFF_TEMPORARY)) {
371 if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
372 !(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
380 * Rule 8: prefer addresses on alive interfaces.
381 * This is a KAME specific rule.
383 if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
384 !(ia->ia_ifp->if_flags & IFF_UP))
386 if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
387 (ia->ia_ifp->if_flags & IFF_UP))
391 * Rule 14: Use longest matching prefix.
392 * Note: in the address selection draft, this rule is
393 * documented as "Rule 8". However, since it is also
394 * documented that this rule can be overridden, we assign
395 * a large number so that it is easy to assign smaller numbers
396 * to more preferred rules.
398 new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
399 if (best_matchlen < new_matchlen)
401 if (new_matchlen < best_matchlen)
404 /* Rule 15 is reserved. */
407 * Last resort: just keep the current candidate.
408 * Or, do we need more rules?
414 best_scope = (new_scope >= 0 ? new_scope :
415 in6_addrscope(&ia_best->ia_addr.sin6_addr));
416 best_policy = (new_policy ? new_policy :
417 lookup_addrsel_policy(&ia_best->ia_addr));
418 best_matchlen = (new_matchlen >= 0 ? new_matchlen :
419 in6_matchlen(&ia_best->ia_addr.sin6_addr,
429 if ((ia = ia_best) == NULL) {
430 *errorp = EADDRNOTAVAIL;
437 return (&ia->ia_addr.sin6_addr);
441 * clone - meaningful only for bsdi and freebsd
444 selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
445 struct ip6_moptions *mopts, struct route_in6 *ro,
446 struct ifnet **retifp, struct rtentry **retrt, int clone,
450 struct ifnet *ifp = NULL;
451 struct rtentry *rt = NULL;
452 struct sockaddr_in6 *sin6_next;
453 struct in6_pktinfo *pi = NULL;
454 struct in6_addr *dst = &dstsock->sin6_addr;
456 char ip6buf[INET6_ADDRSTRLEN];
458 if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
459 dstsock->sin6_addr.s6_addr32[1] == 0 &&
460 !IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
461 printf("in6_selectroute: strange destination %s\n",
462 ip6_sprintf(ip6buf, &dstsock->sin6_addr));
464 printf("in6_selectroute: destination = %s%%%d\n",
465 ip6_sprintf(ip6buf, &dstsock->sin6_addr),
466 dstsock->sin6_scope_id); /* for debug */
470 /* If the caller specify the outgoing interface explicitly, use it. */
471 if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
472 /* XXX boundary check is assumed to be already done. */
473 ifp = ifnet_byindex(pi->ipi6_ifindex);
475 (norouteok || retrt == NULL ||
476 IN6_IS_ADDR_MULTICAST(dst))) {
478 * we do not have to check or get the route for
487 * If the destination address is a multicast address and the outgoing
488 * interface for the address is specified by the caller, use it.
490 if (IN6_IS_ADDR_MULTICAST(dst) &&
491 mopts != NULL && (ifp = mopts->im6o_multicast_ifp) != NULL) {
492 goto done; /* we do not need a route for multicast. */
497 * If the next hop address for the packet is specified by the caller,
498 * use it as the gateway.
500 if (opts && opts->ip6po_nexthop) {
501 struct route_in6 *ron;
503 sin6_next = satosin6(opts->ip6po_nexthop);
505 /* at this moment, we only support AF_INET6 next hops */
506 if (sin6_next->sin6_family != AF_INET6) {
507 error = EAFNOSUPPORT; /* or should we proceed? */
512 * If the next hop is an IPv6 address, then the node identified
513 * by that address must be a neighbor of the sending host.
515 ron = &opts->ip6po_nextroute;
517 (ron->ro_rt->rt_flags & (RTF_UP | RTF_LLINFO)) !=
518 (RTF_UP | RTF_LLINFO)) ||
519 !IN6_ARE_ADDR_EQUAL(&satosin6(&ron->ro_dst)->sin6_addr,
520 &sin6_next->sin6_addr)) {
525 *satosin6(&ron->ro_dst) = *sin6_next;
527 if (ron->ro_rt == NULL) {
528 rtalloc((struct route *)ron); /* multi path case? */
529 if (ron->ro_rt == NULL ||
530 !(ron->ro_rt->rt_flags & RTF_LLINFO)) {
535 error = EHOSTUNREACH;
543 * When cloning is required, try to allocate a route to the
544 * destination so that the caller can store path MTU
552 * Use a cached route if it exists and is valid, else try to allocate
553 * a new one. Note that we should check the address family of the
554 * cached destination, in case of sharing the cache with IPv4.
558 (!(ro->ro_rt->rt_flags & RTF_UP) ||
559 ((struct sockaddr *)(&ro->ro_dst))->sa_family != AF_INET6 ||
560 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr,
563 ro->ro_rt = (struct rtentry *)NULL;
565 if (ro->ro_rt == (struct rtentry *)NULL) {
566 struct sockaddr_in6 *sa6;
568 /* No route yet, so try to acquire one */
569 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
570 sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
572 sa6->sin6_scope_id = 0;
576 rtalloc_mpath((struct route *)ro,
577 ntohl(sa6->sin6_addr.s6_addr32[3]));
579 rtalloc((struct route *)ro);
582 ro->ro_rt = rtalloc1(&((struct route *)ro)
585 RT_UNLOCK(ro->ro_rt);
590 * do not care about the result if we have the nexthop
591 * explicitly specified.
593 if (opts && opts->ip6po_nexthop)
597 ifp = ro->ro_rt->rt_ifp;
599 if (ifp == NULL) { /* can this really happen? */
604 if (ro->ro_rt == NULL)
605 error = EHOSTUNREACH;
609 * Check if the outgoing interface conflicts with
610 * the interface specified by ipi6_ifindex (if specified).
611 * Note that loopback interface is always okay.
612 * (this may happen when we are sending a packet to one of
613 * our own addresses.)
615 if (ifp && opts && opts->ip6po_pktinfo &&
616 opts->ip6po_pktinfo->ipi6_ifindex) {
617 if (!(ifp->if_flags & IFF_LOOPBACK) &&
619 opts->ip6po_pktinfo->ipi6_ifindex) {
620 error = EHOSTUNREACH;
627 if (ifp == NULL && rt == NULL) {
629 * This can happen if the caller did not pass a cached route
630 * nor any other hints. We treat this case an error.
632 error = EHOSTUNREACH;
634 if (error == EHOSTUNREACH)
635 ip6stat.ip6s_noroute++;
640 *retrt = rt; /* rt may be NULL */
646 in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
647 struct ip6_moptions *mopts, struct route_in6 *ro, struct ifnet **retifp)
650 struct route_in6 sro;
651 struct rtentry *rt = NULL;
654 bzero(&sro, sizeof(sro));
658 if ((error = selectroute(dstsock, opts, mopts, ro, retifp,
660 if (ro == &sro && rt && rt == sro.ro_rt)
666 * do not use a rejected or black hole route.
667 * XXX: this check should be done in the L2 output routine.
668 * However, if we skipped this check here, we'd see the following
670 * - install a rejected route for a scoped address prefix
672 * - send a packet to a destination that matches the scoped prefix,
673 * with ambiguity about the scope zone.
674 * - pick the outgoing interface from the route, and disambiguate the
675 * scope zone with the interface.
676 * - ip6_output() would try to get another route with the "new"
677 * destination, which may be valid.
678 * - we'd see no error on output.
679 * Although this may not be very harmful, it should still be confusing.
680 * We thus reject the case here.
682 if (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
683 int flags = (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
685 if (ro == &sro && rt && rt == sro.ro_rt)
691 * Adjust the "outgoing" interface. If we're going to loop the packet
692 * back to ourselves, the ifp would be the loopback interface.
693 * However, we'd rather know the interface associated to the
694 * destination address (which should probably be one of our own
697 if (rt && rt->rt_ifa && rt->rt_ifa->ifa_ifp)
698 *retifp = rt->rt_ifa->ifa_ifp;
700 if (ro == &sro && rt && rt == sro.ro_rt)
706 * clone - meaningful only for bsdi and freebsd
709 in6_selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
710 struct ip6_moptions *mopts, struct route_in6 *ro,
711 struct ifnet **retifp, struct rtentry **retrt, int clone)
714 return (selectroute(dstsock, opts, mopts, ro, retifp,
719 * Default hop limit selection. The precedence is as follows:
720 * 1. Hoplimit value specified via ioctl.
721 * 2. (If the outgoing interface is detected) the current
722 * hop limit of the interface specified by router advertisement.
723 * 3. The system default hoplimit.
726 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
729 if (in6p && in6p->in6p_hops >= 0)
730 return (in6p->in6p_hops);
732 return (ND_IFINFO(ifp)->chlim);
733 else if (in6p && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
734 struct route_in6 ro6;
737 bzero(&ro6, sizeof(ro6));
738 ro6.ro_dst.sin6_family = AF_INET6;
739 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
740 ro6.ro_dst.sin6_addr = in6p->in6p_faddr;
741 rtalloc((struct route *)&ro6);
743 lifp = ro6.ro_rt->rt_ifp;
746 return (ND_IFINFO(lifp)->chlim);
748 return (ip6_defhlim);
750 return (ip6_defhlim);
754 * XXX: this is borrowed from in6_pcbbind(). If possible, we should
755 * share this function by all *bsd*...
758 in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred)
760 struct socket *so = inp->inp_socket;
761 u_int16_t lport = 0, first, last, *lastport;
762 int count, error = 0, wild = 0;
763 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
765 INP_INFO_WLOCK_ASSERT(pcbinfo);
766 INP_WLOCK_ASSERT(inp);
768 /* XXX: this is redundant when called from in6_pcbbind */
769 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
770 wild = INPLOOKUP_WILDCARD;
772 inp->inp_flags |= INP_ANONPORT;
774 if (inp->inp_flags & INP_HIGHPORT) {
775 first = ipport_hifirstauto; /* sysctl */
776 last = ipport_hilastauto;
777 lastport = &pcbinfo->ipi_lasthi;
778 } else if (inp->inp_flags & INP_LOWPORT) {
779 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
782 first = ipport_lowfirstauto; /* 1023 */
783 last = ipport_lowlastauto; /* 600 */
784 lastport = &pcbinfo->ipi_lastlow;
786 first = ipport_firstauto; /* sysctl */
787 last = ipport_lastauto;
788 lastport = &pcbinfo->ipi_lastport;
791 * Simple check to ensure all ports are not used up causing
794 * We split the two cases (up and down) so that the direction
795 * is not being tested on each round of the loop.
801 count = first - last;
804 if (count-- < 0) { /* completely used? */
806 * Undo any address bind that may have
809 inp->in6p_laddr = in6addr_any;
813 if (*lastport > first || *lastport < last)
815 lport = htons(*lastport);
816 } while (in6_pcblookup_local(pcbinfo, &inp->in6p_laddr,
822 count = last - first;
825 if (count-- < 0) { /* completely used? */
827 * Undo any address bind that may have
830 inp->in6p_laddr = in6addr_any;
834 if (*lastport < first || *lastport > last)
836 lport = htons(*lastport);
837 } while (in6_pcblookup_local(pcbinfo,
838 &inp->in6p_laddr, lport, wild));
841 inp->inp_lport = lport;
842 if (in_pcbinshash(inp) != 0) {
843 inp->in6p_laddr = in6addr_any;
852 addrsel_policy_init(void)
855 ADDRSEL_SXLOCK_INIT();
859 /* initialize the "last resort" policy */
860 bzero(&defaultaddrpolicy, sizeof(defaultaddrpolicy));
861 defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
864 static struct in6_addrpolicy *
865 lookup_addrsel_policy(struct sockaddr_in6 *key)
867 struct in6_addrpolicy *match = NULL;
870 match = match_addrsel_policy(key);
873 match = &defaultaddrpolicy;
882 * Subroutines to manage the address selection policy table via sysctl.
885 struct sysctl_req *w_req;
888 static int in6_src_sysctl(SYSCTL_HANDLER_ARGS);
889 SYSCTL_DECL(_net_inet6_ip6);
890 SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
891 CTLFLAG_RD, in6_src_sysctl, "");
894 in6_src_sysctl(SYSCTL_HANDLER_ARGS)
901 bzero(&w, sizeof(w));
904 return (walk_addrsel_policy(dump_addrsel_policyent, &w));
908 in6_src_ioctl(u_long cmd, caddr_t data)
911 struct in6_addrpolicy ent0;
913 if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
914 return (EOPNOTSUPP); /* check for safety */
916 ent0 = *(struct in6_addrpolicy *)data;
918 if (ent0.label == ADDR_LABEL_NOTAPP)
920 /* check if the prefix mask is consecutive. */
921 if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
923 /* clear trailing garbages (if any) of the prefix address. */
924 for (i = 0; i < 4; i++) {
925 ent0.addr.sin6_addr.s6_addr32[i] &=
926 ent0.addrmask.sin6_addr.s6_addr32[i];
931 case SIOCAADDRCTL_POLICY:
932 return (add_addrsel_policyent(&ent0));
933 case SIOCDADDRCTL_POLICY:
934 return (delete_addrsel_policyent(&ent0));
937 return (0); /* XXX: compromise compilers */
941 * The followings are implementation of the policy table using a
943 * XXX such details should be hidden.
944 * XXX implementation using binary tree should be more efficient.
946 struct addrsel_policyent {
947 TAILQ_ENTRY(addrsel_policyent) ape_entry;
948 struct in6_addrpolicy ape_policy;
951 TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
953 struct addrsel_policyhead addrsel_policytab;
956 init_policy_queue(void)
959 TAILQ_INIT(&addrsel_policytab);
963 add_addrsel_policyent(struct in6_addrpolicy *newpolicy)
965 struct addrsel_policyent *new, *pol;
967 MALLOC(new, struct addrsel_policyent *, sizeof(*new), M_IFADDR,
972 /* duplication check */
973 TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
974 if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
975 &pol->ape_policy.addr.sin6_addr) &&
976 IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
977 &pol->ape_policy.addrmask.sin6_addr)) {
981 return (EEXIST); /* or override it? */
985 bzero(new, sizeof(*new));
987 /* XXX: should validate entry */
988 new->ape_policy = *newpolicy;
990 TAILQ_INSERT_TAIL(&addrsel_policytab, new, ape_entry);
998 delete_addrsel_policyent(struct in6_addrpolicy *key)
1000 struct addrsel_policyent *pol;
1005 /* search for the entry in the table */
1006 TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
1007 if (IN6_ARE_ADDR_EQUAL(&key->addr.sin6_addr,
1008 &pol->ape_policy.addr.sin6_addr) &&
1009 IN6_ARE_ADDR_EQUAL(&key->addrmask.sin6_addr,
1010 &pol->ape_policy.addrmask.sin6_addr)) {
1020 TAILQ_REMOVE(&addrsel_policytab, pol, ape_entry);
1028 walk_addrsel_policy(int (*callback)(struct in6_addrpolicy *, void *),
1031 struct addrsel_policyent *pol;
1035 TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
1036 if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
1046 dump_addrsel_policyent(struct in6_addrpolicy *pol, void *arg)
1049 struct walkarg *w = arg;
1051 error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
1056 static struct in6_addrpolicy *
1057 match_addrsel_policy(struct sockaddr_in6 *key)
1059 struct addrsel_policyent *pent;
1060 struct in6_addrpolicy *bestpol = NULL, *pol;
1061 int matchlen, bestmatchlen = -1;
1062 u_char *mp, *ep, *k, *p, m;
1064 TAILQ_FOREACH(pent, &addrsel_policytab, ape_entry) {
1067 pol = &pent->ape_policy;
1068 mp = (u_char *)&pol->addrmask.sin6_addr;
1069 ep = mp + 16; /* XXX: scope field? */
1070 k = (u_char *)&key->sin6_addr;
1071 p = (u_char *)&pol->addr.sin6_addr;
1072 for (; mp < ep && *mp; mp++, k++, p++) {
1075 goto next; /* not match */
1076 if (m == 0xff) /* short cut for a typical case */
1086 /* matched. check if this is better than the current best. */
1087 if (bestpol == NULL ||
1088 matchlen > bestmatchlen) {
1090 bestmatchlen = matchlen;